Ricardo: I would just pull the intake manifold. You better off that way. Then you can look inside to see what you have.

I would also pull the oil pan and check a few bearings. Check the mains #1 and #2 and rods #1 and #2 and #3 and #4. You'll get a good idea of what you bought. As far as making 450 horse power thats easy to do today. You may have bougth something hot.Good LuckBob